From the California Highway Patrol:

On the evening of Wednesday December 30, 2015, at approximately 10:50 PM, 25 year old Brittany Campbell of Sacramento, CA, was driving her 2011 Dodge pickup on US-101 northbound south of Newton B. Drury Scenic Parkway.  The highway was wet, but the weather was clear. 

For reasons still under investigation, Ms. Campbell allowed her vehicle to cross over the southbound lanes of US-101 where it ran off the west edge of the highway and collided with a tree.

Ms. Campbell’s passengers were her two children; a 1 month old infant, and a 2 year old child.  The two year old child was in the rear seat properly restrained in a child passenger safety seat.  The one month old was in the rear seat in a properly installed child safety seat appropriate for the child’s age, but the infant was not properly buckled into the seat.  Upon impact with the tree, the infant was ejected from the pickup and sustained major injuries including head and facial trauma.  All three were transported to Mad River Community Hospital in Arcata, CA.  Ms. Campbell, who had not been wearing her seatbelt, complained of pain only.  The 2 year old was uninjured.  The infant was transported to an out-of-area children’s hospital with major injuries. 

The highway was not closed, DUI was not suspected to be a factor.  This collision remains under investigation.